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The video, which rapidly spread across social media, added to a growing body of videos from across the nation that showed officers responding to protests against police violence with more police violence. Fury among online supporters of the protests was heightened by the police department's initial claim that the man "tripped and fell," a description at direct odds with the video.

Gov. Andrew M. Cuomo of New York condemned the actions of the officers in a statement late Thursday night.

"The incident in Buffalo is wholly unjustified and utterly disgraceful," Mr. Cuomo said. "I've spoken with City of Buffalo Mayor Byron Brown and we agree that the officers involved should be immediately suspended. Police officers must enforce " NOT ABUSE " the law."

"It sickens me," the Erie County executive, Mark Poloncarz, wrote on Twitter about the video, which includes both vulgarity and disturbing images.

The simple callousness of the thug wearing the dark blue uniform of a public service officer who pushed this 75 year old man to the ground is simple unfathomable. And then for the phalanx to continue marching forward - en mass - without a single individual even stopping for a second to check on his welfare after witnessing his head strike the concrete, with blood beginning to pool around his skull, is simply inexplicably inhumane and barbaric based upon the circumstances.

There is a vile, vicious poison running through far too many law enforcement officials all over this nation. They don't seek to keep peace, they revel in projecting state-sanctioned violence in service of whom exactly? What citizens want 75 year old men pushed to the ground for simply verbally engaging a law officer?